Zusammenfassung:
Ziel: Das Ziel dieser Arbeit war es, die Möglichkeit der Differenzierung seröser und putrider
Flüssigkeiten mit diffusionsgewichteter MRT zu untersuchen und drei verschiedene Sequenzschemata
zu vergleichen. Material und Methoden: Hierzu wurden 13 Punktatproben (aus 6 serösen und 7 putriden Flüssigkeitsansammlungen)
sowie 19 Patienten (mit 12 serösen und 7 putriden Flüssigkeitsansammlungen) mit einer
diffusionsgewichteten Spin Echo-(SE), stimulierten Echo-(STE) und fettunterdrückten
SE-Sequenz (SE-SPIR) untersucht. In vitro wurden 4 b-Faktoren (0, 87, 355, 798 s/mm2 für SE und SE-SPIR, 0, 51, 204, 460 s/mm2 für STE) gewählt sowie der ADC (apparent diffusion coefficient) berechnet. Bei den
in vivo-Untersuchungen wurden bei ansonsten identischen Sequenzen nur zwei b-Faktoren akquiriert
(0 und 598 s/mm2 für SE und SE-SPIR, 0 und 360 s/mm2 für STE) und die normalisierte Signalreduktion nach Schaltung der Diffusionsgradienten
bestimmt. Eine Navigatorecho-Technik und eine periphere Pulstriggerung dienten der
Bewegungsartefaktreduktion. Ergebnisse: In vitro lag der ADC in seröser Flüssigkeit nahe demjenigen freien Wassers, während sich in
putriden Flüssigkeiten ein deutlich geringerer ADC fand. In vivo zeigten die diffusionsgewichteten Bilder in serösen Flüssigkeitsansammlungen eine
deutliche Signalreduktion (auf 22-32 % der Ausgangswerte), während in putriden Flüssigkeitsansammlungen
nur eine geringe Signalreduktion (auf 86-94 % der Ausgangswerte) nachweisbar war (p
< 0,05). Diskussion: Mit allen drei untersuchten diffusionsgewichteten Sequenzen können seröse und putride
Flüssigkeiten differenziert werden.
Differentiation of Serous and Purulent Fluids in vitro and in vivo by Means of Diffusion-Weighted MR Imaging.
Aim: The aim of this study was to test the feasibility for differentiation of serous fluid
collections and abscess fluid with diffusion-weighted imaging and to compare three
different diffusion sequences. Material and Methods: Thirteen puncture samples (6 serous, 7 purulent) and 19 patients with either serous
fluid collections (n = 12) or abscesses (n = 7) were examined with diffusion-weighted
spin-echo (SE), stimulated-echo (STE), and fat-suppressed SE (SE-SPIR) sequences.
For in vitro studies 4 different b-factors (0, 87, 355, 798 s/mm2 in SE and SE-SPIR and 0, 51, 204, 460 s/mm2 in STE) were chosen and the apparent diffusion coefficient (ADC) was calculated.
For in vivo measurements identical sequences with two b-factors (0,598 s/mm2 in SE and SE-SPIR and 0,360 s/mm2 in STE) were applied and the normalized signal attenuation was calculated. A navigator-echo
technique and peripheral pulse triggering was used for motion artifact reduction.
Results: The in vitro study yielded an ADC of serous fluid, which was close to that of free water, whereas
for purulent fluid a significantly lower ADC was calculated. During
in vivo
examinations, serous fluids showed a strong signal attenuation (down to 22 - 32 %
of basic value) compared to a minor signal attenuation in purulent fluids (down to
86 - 94 % of basic value) (p < 0.05). Conclusions: In summary, with all three investigated diffusion schemes serous and purulent fluids
can be clearly differentiated.
Schlüsselwörter:
Diffusionsgewichtete Magnetresonanztomographie - Abszess - Serom
Key words:
Diffusion-weighted magnetic resonance imaging - Abscess - Seroma
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Dr. med. Elmar Spüntrup
Klinik für Radiologische DiagnostikMedizinische Einrichtungen der RWTH Aachen
Pauwelsstraße 30, 52057 Aachen
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Fax: 0241-8888499
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